Hydrogen is not typically considered corrosive, but as a common element in diaphragm seal applications, there are certain circumstances where it may cause issues. For these times, Bliss Anand America and Badotherm Netherlands offer you a solution – Gold Coated Diaphragm Seals. The gold protects the fill fluid from becoming saturated with hydrogen, leading to more accurate measurement for your project.
So what is hydrogen permeation?
Hydrogen is usually found is a diatomic state, as two hydrogen atoms, or H2. These molecules do not permeate a regular sized diaphragm, at a standard thickness of 75 μm. However, under certain pressures and temperatures, the diatomic hydrogen splits into two H+ ions that are smaller than the space between the molecules of the material used to construct a regular diaphragm. This allows the H+ ions to slip between the cracks. Having permeated the diaphragm, the H+ icons join back into H2, dissolving into, and eventually saturating, the fill fluid. Over time, hydrogen gas bubbles form, altering the performance of the mounted transmitter.
The Bliss Anand America – Badotherm Netherlands Solution
Gold is a noble metal, which means it is more resistant to corrosion than most other materials. Adding a layer of gold to a base metal provides an extra layer of protection to the seal. The H+ ions are not able to permeate the gold diaphragm foil, allowing your fill fluid to remain pure.
We take our seals the extra mile beyond our competition, and for increased security at extreme conditions, we offer 40µm thickness that can withstand temperatures up to 752 °F (400 °C). This design is approved by international end-users including Royal Dutch Shell.
Gold also increases the chemical resistance of the seals, and can therefore be used in multiple ways:
- To protect against hydrogen permeation, as described above, only the diaphragm is coated.
- To increase chemical resistance, the coating can be extended to the outside diameter of the gasket surface.
Do your diaphragm seals need the gold standard of protection? Download a brochure here for more information or give us a call at 281.479.2547 to speak to our sales team.